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Income Taxes - Narrative (Details) $ in Millions | 3 Months Ended
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Mar. 31, 2019 USD ($)
AMT Credits |
Tax Credit Carryforward [Line Items] |
Tax benefits released | $ 16.3
Accrued Interest Associated With Previous Uncertain Tax Positions |
Tax Credit Carryforward [Line Items] |
Tax benefits released | 3.1
Gain On Divestitures - State Income Taxes |
Tax Credit Carryforward [Line Items] |
Unrecognized tax benefits | $ 0.5

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